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Finding the Fourth Proportional to 358.79, 538.04 and 115.18

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Solution

The fourth proportional to 358.79, 538.04 and 115.18 is: 172.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.79 : 538.04 = 115.18 : x
  2. Step 2: Convert to fraction form
    358.79/538.04 = 115.18/x
  3. Step 3: Cross multiply
    358.79x = 538.04 × 115.18
  4. Step 4: Simplify right side
    358.79x = 61,970.39
  5. Step 5: Solve for x
    x = 61,970.39/358.79
  6. Step 6: Final answer
    x = 172.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.